SUNRPC server: record the destination address of a request

Save the destination address of an incoming request over TCP like is
done already for UDP. It is necessary later for callbacks by the server.

Signed-off-by: Frank van Maarseveen <frankvm@frankvm.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 20 insertions, 0 deletions

diff --git a/net/sunrpc/svcsock.c b/net/sunrpc/svcsock.c
index 5baf48de2558..64b9b8c743c4 100644
--- a/net/sunrpc/svcsock.c
+++ b/net/sunrpc/svcsock.c
@@ -644,6 +644,7 @@ svc_recvfrom(struct svc_rqst *rqstp, struct kvec *iov, int nr, int buflen)
         struct msghdr msg = {
                 .msg_flags      = MSG_DONTWAIT,
         };
+        struct sockaddr *sin;
         int len;
 
         len = kernel_recvmsg(svsk->sk_sock, &msg, iov, nr, buflen,
@@ -654,6 +655,19 @@ svc_recvfrom(struct svc_rqst *rqstp, struct kvec *iov, int nr, int buflen)
         memcpy(&rqstp->rq_addr, &svsk->sk_remote, svsk->sk_remotelen);
         rqstp->rq_addrlen = svsk->sk_remotelen;
 
+        /* Destination address in request is needed for binding the
+         * source address in RPC callbacks later.
+         */
+        sin = (struct sockaddr *)&svsk->sk_local;
+        switch (sin->sa_family) {
+        case AF_INET:
+                rqstp->rq_daddr.addr = ((struct sockaddr_in *)sin)->sin_addr;
+                break;
+        case AF_INET6:
+                rqstp->rq_daddr.addr6 = ((struct sockaddr_in6 *)sin)->sin6_addr;
+                break;
+        }
+
         dprintk("svc: socket %p recvfrom(%p, %Zu) = %d\n",
                 svsk, iov[0].iov_base, iov[0].iov_len, len);
 
@@ -1064,6 +1078,12 @@ svc_tcp_accept(struct svc_sock *svsk)
                 goto failed;
         memcpy(&newsvsk->sk_remote, sin, slen);
         newsvsk->sk_remotelen = slen;
+        err = kernel_getsockname(newsock, sin, &slen);
+        if (unlikely(err < 0)) {
+                dprintk("svc_tcp_accept: kernel_getsockname error %d\n", -err);
+                slen = offsetof(struct sockaddr, sa_data);
+        }
+        memcpy(&newsvsk->sk_local, sin, slen);
 
         svc_sock_received(newsvsk);